Balanced slide-valve



(No Model.)

W; B. TUBMAN,

' BALANCED SLIDE VALVE.

Patented Nov. 28, 1882.

INVENTOR WITNESSES:

BY I

ATTORNEYS.

UNITED STATES PATENT OFFICE.

WILLIAM B. TUBMAN, OF WALDRON ARKANSAS.

BALANCED SLI DE-VALVE.

SPECIFICATION forming part of Letters Patent No. 268,319, dated November 28, 1882.

Application filed April 10, 1882. (No model.)

and relates to the packing of the valve and arrangement of the steam-ports, as hereinafter described and claimed.

Reference is to be had to the accompanying drawings, i'ormingpartot' this specificatiomin which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a side view of the valve partially broken open, and in position in the steam-chest, the side of which is removed. Fig. 2 is a longitudinal section of the steam chest and valve. Fig. 3 is a transverse section on the line as or, and Fig. 4 shows one of the packings.

A is the steam-chest, having ports a a. to correspond with those of the cylinderon which the chest is set, and provided with steam-supply port b and steam-exhaust port 0, both ports being on the same side of the chest.

B is the valve, internally recessed or formed with a cavity, 19, to which steam is supplied by an entrance-port, 0, opening out at the side of the valve, for communication with the inlet steam-port b in the side of the chest.

The valve B is held and guided by a frame or cage, 1t, fixed within the steam-chest, and at the top of the valve is a packing-strip, f, pressed to the valve by set-screws g, passing through a cross-bar, t, that is secured on frame It. This allows the top of the chest to be removed withoutdisturbing the valve, and to fa cilitate access to the valve the top and one side of the chest are formed in one piece, for removal at once.

The valve 1% also fitted at one side with a packing-strip, h, set up by a set-screw, g, tapped through across-bar, t, of frame R. Both strips f h serve as guides for the valve,

and the valve is formed with raised edges or flanges s, that take upon the edges of the strips.

Beneath the strips f h the valve is grooved to receive packings Zm. The steam from the middle cavity, 9, has access to the back of strips fh by openings 6 w and there are also openings i, that admit steam behind the packings l m or there may be springs inserted behind the packings lm to force them outward. By thisconstruction the valve is perfectly packed, and the valve can be readily and perfectly adj usted before the cover is put on the chest.

One or more ports 0 may be formed in valve B, and one or moresteam-supply ports I; in the side of the steam-chest, for the purpose of ad mitting and cutting otf the steam at any point in the travel of the piston.

Having thus fully described my invention, 1 claim as new and desire to secure by Letters Patent- 1. The cage or frame B, combined with slidevalve B, substantially as shown anddescribed.

2. The combination of cage It, provided with cross-strips t t and set-screws g g, the packing-stripsf h, and valve B, substantially as described.

3. The packings l m, combined with valve B and paeking-stripsf h, substantially as shown and described.

4. The valve B, provided with packing l m, set in recesses, in combination with the supporting guide-strips fh, allarranged as shown.

5. The valveB, provided with packing-strips fh and formed with internal steam-cavity p and passage 0 w, substantially as described.

WILLIAM BRIGHT TUBMAN.

Witnesses:

ROBERT M. FEATHERSTON, J GEN L. RioHEY. 

